Keyence Corporation

Hiroomi Ohori

Taichi Tajika

Hidezumi Nagata

Taiga Nomi

Tomomi Izaki

Hiroyuki Morita

Hideaki Miyoshi

A code reader includes: a plurality of illumination units that irradiate the workpiece with illumination light; an imaging unit that includes a Scheimpflug optical system and generates and outputs a code image; and a control unit that executes decoding processing on the code image. The Scheimpflug optical system is used to form a focal plane extending from a near side to a far side of the imaging unit and make light distribution angles of the plurality of illumination units different or make positions where optical axes of the plurality of illumination units intersect the focal plane different in a direction in which the focal plane extends to suppress insufficiency of illuminance on the far side with respect to the near side of the focal plane or to make illuminance on the far side equal to or higher than illuminance on the near side.

Code reader and code reading method

A code reader includes an illumination section, an imaging unit having a Scheimpflug optical system, a control unit that executes decoding processing on the code attached to a workpiece based on an image output from the imaging unit, and a housing that stores the illumination section, the imaging unit, and the control unit and has a light receiving window. The light receiving window is provided on the first side surface of the housing, and has a short side extending in a lateral direction and a long side, longer than the short side, extending in a longitudinal direction. A plane formed by the light receiving window intersects a plane formed by the focal plane of the Scheimpflug optical system. The illumination section is disposed adjacent to the light receiving window in the lateral direction of the light receiving window.

Code reader

Evaluation of a code misassignment risk is enabled, and occurrence of misassignment of a code is prevented. A code reader includes: an imaging unit that includes a Scheimpflug optical system including a lens and an image sensor having a light receiving surface inclined with respect to an optical axis of the lens, the imaging unit generating and outputting a code image including the code; and a control unit that executes decoding processing on the code image. The control unit calculates an index for evaluating whether or not a code to which the decoding processing has been applied is a code that has been decoded in a depth-of-field region formed substantially perpendicular to a conveying surface of a conveyor by the Scheimpflug optical system based on a result of the decoding processing, and determines whether or not the code is assigned to a wrong workpiece based on the index.

An optical information reading deviceincludes an aiming moduleconfigured to irradiate aiming light for instructing an imaging area of image data generated by an imaging module, a trigger switchfor starting imaging processing by the imaging module, an aiming switchB for causing the aiming moduleto irradiate the aiming light, and a reading unitconfigured to read information of the symbol. The reading unitis configured to, in an aiming state in which irradiation processing for the aiming light by the aiming moduleis executed by operation of the aiming switchB, detect that the trigger switchis operated and read, based on the image data generated by the imaging processing of the imaging module, information of the symbol included in a predetermined partial area PA corresponding to an irradiation position of the aiming light.

Optical information reading device and optical information reading method

[Object] To enhance accuracy at the time of setting with consideration of a cell size of a code when an exposure time is automatically set. [Means to solve the problems] An upper limit of an exposure time of an imaging part as a restriction condition for reading a code attached to a workpiece is calculated based on a moving speed of the workpiece, which is inputted by an input part, and a cell size, which is calculated by a cell size calculation part. An exposure time of the imaging part is set within the restriction condition by analyzing a plurality of images, which includes a code and is obtained by taking images multiple times by changing the exposure time of the imaging part.

Optical information reading device

[Object] To enhance a reading accuracy of a code even when a light amount, which can be received by an imaging element, varies greatly. [Means to solve the problems] A plurality of second images in response to a plurality of different conversion characteristics is generated by using the first image obtained at the time of setting of an optical information reading device. The results, in which codes included in the generated second images are respectively decoded by a decoding part, are analyzed, and one of the conversion characteristics is selected. The second image in response to the selected conversion characteristic is generated by using the first image at the time of operation of the optical information reading device.

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Osaka, Japan

Hiroomi Ohori